[To rel/0.12] [IOTDB-1325] StackOverflow Exception in group by natural month query #3072
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Steps:
insert into root.sg.d1(time,s1) values(1522425600000, 1)
select count from root.sg.d1 group by ((2018-01-31, 2018-03-31],1mo)
Reason:
Copy() method of GroupByMonthFilter doesn't deep copy enough elements.